Joseph is the “love child” of Arnold and his former family housekeeper, Mildred Patricia Baena. He was only 13 when Arnold’s then-wife of 25 years, Maria Shriver, discovered the torrid secret.

Schwarzenegger shared some details of his complicated family situation with Howard Stern in June 2015:

“He’s terrific, and he totally understands the situation,” the actor explained of son Joseph. “So, it all has worked out … It’s a very tough situation for him. It’s a very tough situation for my kids, very tough situation for my family. It was tough for everybody. But it has happened, and now we have to figure it out, right?”

Days before celebrating Joseph’s birthday, Arnold also heaped praise on his son Christopher, who also just turned 20.

“You’re a wonderful student, a hilarious and kind soul, and a fantastic son,” Arnold wrote alongside a throwback photo of the two sharing a father-son smooch. “I’m so proud of you, I love you, and I can’t wait to see what’s next.”

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